Here's a specific example of a question I do not think science can answer:

How many kittens lives is worth one human life?

Or, perhaps more cynical, how many lives of poor people is worth the life of one rich person?

I think these are things that just come from people's basic intuitions and aesthetic sense. It's going to have a different answer in different cultures, and I'm not convinced there is one right answer that all cultures will converge to.